| County Seat | County |
|---|
| Quincy | |
| Cairo | |
| Greenville | |
| Belvidere | |
| Mount Sterling | |
| Princeton | |
| Hardin | |
| Mount Carroll | |
| Virginia | |
| Urbana | |
| Taylorville | |
| Marshall | |
| Louisville | |
| Carlyle | |
| Charleston | |
| Chicago | |
| Robinson | |
| Toledo | |
| Clinton | |
| Sycamore | |
| Tuscola | |
| Wheaton | |
| Paris | |
| Albion | |
| Effingham | |
| Vandalia | |
| Paxton | |
| Benton | |
| Lewistown | |
| Shawneetown | |
| Carrollton | |
| Morris | |
| McLeansboro | |
| Carthage | |
| | County Seat | County |
|---|
| Elizabethtown | |
| Oquawka | |
| Cambridge | |
| Watseka | |
| Murphysboro | |
| Newton | |
| Mount Vernon | |
| Jerseyville | |
| Galena | |
| Vienna | |
| Geneva | |
| Kankakee | |
| Yorkville | |
| Galesburg | |
| Waukegan | |
| Ottawa | |
| Lawrenceville | |
| Dixon | |
| Pontiac | |
| Lincoln | |
| Decatur | |
| Carlinville | |
| Edwardsville | |
| Salem | |
| Lacon | |
| Havana | |
| Metropolis | |
| Macomb | |
| Woodstock | |
| Bloominton | |
| Petersburg | |
| Aledo | |
| Waterloo | |
| Hillsboro | |
| | County Seat | County |
|---|
| Jacksonville | |
| Sullivan | |
| Oregon | |
| Peoria | |
| Pinckneyville | |
| Monticello | |
| Pittsfield | |
| Golconda | |
| Mound City | |
| Hennepin | |
| Chester | |
| Olney | |
| Rock Island | |
| Harrisburg | |
| Springfield | |
| Rushville | |
| Winchester | |
| Shelbyville | |
| Belleville | |
| Toulon | |
| Freeport | |
| Pekin | |
| Jonesboro | |
| Danville | |
| Mount Carmel | |
| Monmouth | |
| Nashville | |
| Fairfield | |
| Carmi | |
| Morrison | |
| Joliet | |
| Marion | |
| Rockford | |
| Eureka | |
|
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